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Use GroupDocs.Signature for .NET API to build applications in C#, ASP.NET, and other .NET-based technologies, that allow you to sign digital business documents, spreadsheets, presentations, images and PDF files. You can add signatures of many types, such as, text, image, barcode, QR-code etc to digitally secure your electronic files. Our digital signature API, allows you to fetch all registered certificates from system. GroupDocs.Signature for .NET empowers you with simple and advanced search options to locate your required signatures in a flash. The option to customize signature properties, such as, dimensions, shadow, alignment and more is also available through GroupDocs.Signature for .NET API.

Easily Add Digital Signatures

GroupDocs.Signature for .NET API allows you to add various types of signatures to supported file formats. The signature types, such as Text, Image, Digital, Stamp, QR-Code, Barcode, and Metadata can be applied using GroupDocs.Signature for .NET. Following code example shows how to apply text signature to a PDF document:

Search Signatures & Certificates

GroupDocs.Signature for .NET API, allows you to search for Digital certificates from Word documents, Excel spreadsheets, and PDF files. You can also fetch all digital certificates registered in system. Metadata signatures can also be searched in Word documents, Excel spreadsheets, images and PDF files, using GroupDocs.Signature for .NET API.

Through GroupDocs.Signature for .NET API, you can search QR-Code and Barcode signatures in any document, presentation, spreadsheet, image, as well as PDF file, and fetch the search progress. You can also search custom data object from documents signed with QR-Code Signature.

Advanced Search Options for Barcode

You can search and locate your required barcode through GroupDocs.Signature for.NET API very easily, as our signature API offers advanced search options. These enable you to search barcode on a particular page, search throughout a document, specify different pages to search (first, last, even, odd), search for barcode of particular encoding type, search barcode based on specific text string, or search barcode based on string with “contains” option.